Figure 2From: Abnormal cortical responses to somatosensory stimulation in medication-overuse headache Somatosensory evoked potential (SEP) amplitude grand average in each study group (HV, healthy volunteers; MOii, migraine without aura interictally; MOi, migraine without aura Ictally; MOH, medication overuse headache; data expressed as mean ± SEM).Back to article page